From 09e589b23c5b20405c7778d8d0adaf5d1ab195e6 Mon Sep 17 00:00:00 2001
From: Victor Brekenfeld <github@drakulix.de>
Date: Wed, 21 Nov 2018 09:28:15 +0100
Subject: [PATCH] Generate (e)gl_bindings based on feature set

---
 Cargo.toml | 10 ++++----
 build.rs   | 68 +++++++++++++++++++++++++++++-------------------------
 2 files changed, 42 insertions(+), 36 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index 64de8fb..025e680 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -34,16 +34,18 @@ error-chain = "0.11.0"
 lazy_static = "1.0.0"
 
 [build-dependencies]
-gl_generator = "0.9"
+gl_generator = { version = "0.9", optional = true }
 
 [features]
 default = ["backend_winit", "backend_drm", "backend_libinput", "backend_udev", "renderer_glium", "xwayland"]
-backend_winit = ["winit", "wayland-server/dlopen", "wayland-client/dlopen"]
-backend_drm = ["drm", "gbm"]
+backend_winit = ["winit", "wayland-server/dlopen", "wayland-client/dlopen", "backend_egl"]
+backend_drm = ["drm", "backend_egl"]
+backend_egl = ["gl_generator"]
 backend_libinput = ["input"]
 backend_session = []
 backend_session_udev = ["udev", "backend_session"]
 backend_session_logind = ["dbus", "systemd", "backend_session"]
 backend_udev = ["udev", "backend_drm", "backend_session_udev"]
-renderer_glium = ["glium"]
+renderer_gl = ["gl_generator"]
+renderer_glium = ["renderer_gl", "glium"]
 xwayland = []
\ No newline at end of file
diff --git a/build.rs b/build.rs
index 700499f..b119e11 100644
--- a/build.rs
+++ b/build.rs
@@ -8,37 +8,41 @@ fn main() {
 
     println!("cargo:rerun-if-changed=build.rs");
 
-    let mut file = File::create(&dest.join("egl_bindings.rs")).unwrap();
-    Registry::new(
-        Api::Egl,
-        (1, 5),
-        Profile::Core,
-        Fallbacks::All,
-        [
-            "EGL_KHR_create_context",
-            "EGL_EXT_create_context_robustness",
-            "EGL_KHR_create_context_no_error",
-            "EGL_KHR_platform_x11",
-            "EGL_KHR_platform_android",
-            "EGL_KHR_platform_wayland",
-            "EGL_KHR_platform_gbm",
-            "EGL_EXT_platform_base",
-            "EGL_EXT_platform_x11",
-            "EGL_MESA_platform_gbm",
-            "EGL_EXT_platform_wayland",
-            "EGL_EXT_platform_device",
-            "EGL_KHR_image_base",
-        ],
-    ).write_bindings(gl_generator::GlobalGenerator, &mut file)
-    .unwrap();
+    if env::var_os("CARGO_FEATURE_BACKEND_EGL").is_some() {
+        let mut file = File::create(&dest.join("egl_bindings.rs")).unwrap();
+        Registry::new(
+            Api::Egl,
+            (1, 5),
+            Profile::Core,
+            Fallbacks::All,
+            [
+                "EGL_KHR_create_context",
+                "EGL_EXT_create_context_robustness",
+                "EGL_KHR_create_context_no_error",
+                "EGL_KHR_platform_x11",
+                "EGL_KHR_platform_android",
+                "EGL_KHR_platform_wayland",
+                "EGL_KHR_platform_gbm",
+                "EGL_EXT_platform_base",
+                "EGL_EXT_platform_x11",
+                "EGL_MESA_platform_gbm",
+                "EGL_EXT_platform_wayland",
+                "EGL_EXT_platform_device",
+                "EGL_KHR_image_base",
+            ],
+        ).write_bindings(gl_generator::GlobalGenerator, &mut file)
+        .unwrap();
+    }
 
-    let mut file = File::create(&dest.join("gl_bindings.rs")).unwrap();
-    Registry::new(
-        Api::Gles2,
-        (3, 2),
-        Profile::Compatibility,
-        Fallbacks::None,
-        ["GL_OES_EGL_image"],
-    ).write_bindings(gl_generator::GlobalGenerator, &mut file)
-    .unwrap();
+    if env::var_os("CARGO_FEATURE_RENDERER_GL").is_some() {
+        let mut file = File::create(&dest.join("gl_bindings.rs")).unwrap();
+        Registry::new(
+            Api::Gles2,
+            (3, 2),
+            Profile::Compatibility,
+            Fallbacks::None,
+            ["GL_OES_EGL_image"],
+        ).write_bindings(gl_generator::StructGenerator, &mut file)
+        .unwrap();
+    }
 }